Manchester United striker Angelo Henriquez has joined Wigan on loan for the remainder of the season.
Henriquez, 18, was signed by Sir Alex Ferguson from Universidad de Chile last summer but has yet to make an appearance for United.
Martinez told Wigan's official website: "We're really excited about Angelo because he is a very young man with a huge potential; he's a goalscorer with clever movement inside the box and has had a very successful time with his former club Universidad.
"We hope to have a good partnership in terms of allowing Angelo to develop as a footballer and learn of the demands of the English game, because I feel he can bring us something different in the forward line.
"I'm sure the fans will give him a great welcome on Saturday and it will provide him with the perfect opportunity to begin his experiences on the pitch in English football which is very exciting."
Henriquez, a full Chile international, could make his Wigan debut in Saturday's FA Cup third-round home clash with League One side Bournemouth.
"This is a fantastic opportunity for me and I am really excited after the manager has given this chance for me to prove myself," the teenage striker said.
"Now I need to work to try and earn my place in the team."